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fix(safe-json): parse negative BigInts #274

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fix(safe-json): parse negative BigInts #274

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851534e
Fixed bug where negative integers aren't parsed properly
bramcohen Jul 15, 2026
caa9823
FIxed bug in parsing of negative numbers with magnitude greater than …
bramcohen Jul 15, 2026
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4 changes: 2 additions & 2 deletions misc/safe-json/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -24,10 +24,10 @@ const JSONParse = (json: string) => {
*/
// prettier-ignore
// eslint-disable-next-line no-useless-escape
const numbersBiggerThanMaxInt = /(?<!")(?<=:)\b(\d{17,}|(?:[9](?:[1-9]07199254740991|0[1-9]7199254740991|00[8-9]199254740991|007[2-9]99254740991|007199[3-9]54740991|0071992[6-9]4740991|00719925[5-9]740991|007199254[8-9]40991|0071992547[5-9]0991|00719925474[1-9]991|00719925474099[2-9])))(?=[,\}\]]|$)/g;
const numbersBiggerThanMaxInt = /(?<!")(?<=:)-?(\d{17,}|(?:[9](?:[1-9]07199254740991|0[1-9]7199254740991|00[8-9]199254740991|007[2-9]99254740991|007199[3-9]54740991|0071992[6-9]4740991|00719925[5-9]740991|007199254[8-9]40991|0071992547[5-9]0991|00719925474[1-9]991|00719925474099[2-9])))(?=[,\}\]]|$)/g;
const serializedData = json.replace(numbersBiggerThanMaxInt, (match) => `"${match}n"`);
return JSON.parse(serializedData, (_, value) => {
const isCustomFormatBigInt = typeof value === "string" && value.match(/^\d+n$/);
const isCustomFormatBigInt = typeof value === "string" && value.match(/^-?\d+n$/);

if (isCustomFormatBigInt) return BigInt(value.substring(0, value.length - 1));

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4 changes: 4 additions & 0 deletions misc/safe-json/test/index.test.ts
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Expand Up @@ -28,6 +28,10 @@ describe("@walletconnect/safe-json", () => {
const result = safeJsonParse(safeJsonStringify({ bigint: BigInt(1) }));
chai.expect(result).to.deep.eq({ bigint: BigInt(1) });
});
it("should handle negative bigint", () => {
const result = safeJsonParse(safeJsonStringify({ amount: BigInt(-100) }));
chai.expect(result).to.deep.eq({ amount: BigInt(-100) });
});
it("should handle number inside string literal. Case 1", () => {
const nested = '{"x":"12345678901234567,"}';
const result = safeJsonParse(nested);
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